Add example for arduino board.

[bertos.git] / boards / arduino / hw / hw_afsk.h

diff --git a/boards/arduino/hw/hw_afsk.h b/boards/arduino/hw/hw_afsk.h
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+++ b/boards/arduino/hw/hw_afsk.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2006 Develer S.r.l. (http://www.develer.com/)
+ * All Rights Reserved.
+ * -->
+ *
+ * \brief AFSK modem hardware-specific definitions.
+ *
+ * \version $Id$
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ */
+
+#ifndef HW_AFSK_H
+#define HW_AFSK_H
+
+#include "cfg/cfg_arch.h"
+
+#include <avr/io.h>
+
+struct Afsk;
+void hw_afsk_adcInit(int ch, struct Afsk *_ctx);
+void hw_afsk_dacInit(int ch, struct Afsk *_ctx);
+
+/**
+ * Initialize the specified channel of the ADC for AFSK needs.
+ * The adc should be configured to have a continuos stream of convertions.
+ * For every convertion there must be an ISR that read the sample
+ * and call afsk_adc_isr(), passing the context and the sample.
+ *
+ * \param ch channel to be used for AFSK demodulation.
+ * \param ctx AFSK context (\see Afsk). This parameter must be saved and
+ *            passed back to afsk_adc_isr() for every convertion.
+ */
+
+/*
+ * This macro will be called for AFSK initialization. We could implement everything here as a macro,
+ * but since initialization is rather complicated we decided to split its own function. Such function
+ * is defined in hw_afsk.c.
+ * Remember: since this .c file is not created by the wizard, you must add it to your_project_name.mk.
+ * If you create the file using BeRTOS SDK, it will be added for you.
+ */
+#define AFSK_ADC_INIT(ch, ctx) hw_afsk_adcInit(ch, ctx)
+
+/*
+ * Activate strobe pin. We use it for debugging purposes. If you don't use it, simply
+ * leave empty the following macros
+ */
+#define AFSK_STROBE_INIT() do { DDRB |= BV(5); } while (0)
+
+/*
+ * Set the pin high. This macro is called at the beginning of the interrupt routine
+ */
+#define AFSK_STROBE_ON()   do { PORTB |= BV(5); } while (0)
+
+/*
+ * Set the pin low. This macro is called at the end of the interrupt routine
+ */
+#define AFSK_STROBE_OFF()  do { PORTB &= ~BV(5); } while (0)
+
+/**
+ * Initialize the specified channel of the DAC for AFSK needs.
+ * The DAC has to be configured in order to call an ISR for every sample sent.
+ * The DAC doesn't have to start the IRQ immediatly but have to wait
+ * the AFSK driver to call AFSK_DAC_IRQ_START().
+ * The ISR must then call afsk_dac_isr() passing the AFSK context.
+ * \param ch DAC channel to be used for AFSK modulation.
+ * \param ctx AFSK context (\see Afsk).  This parameter must be saved and
+ *             passed back to afsk_dac_isr() for every convertion.
+ */
+#define AFSK_DAC_INIT(ch, ctx)   do { (void)ch, (void)ctx; DDRD |= 0xF0; DDRB |= BV(3); } while (0)
+
+/**
+ * Start DAC convertions on channel \a ch.
+ * \param ch DAC channel.
+ */
+#define AFSK_DAC_IRQ_START(ch)   do { (void)ch; extern bool hw_afsk_dac_isr; PORTB |= BV(3); hw_afsk_dac_isr = true; } while (0)
+
+/**
+ * Stop DAC convertions on channel \a ch.
+ * \param ch DAC channel.
+ */
+#define AFSK_DAC_IRQ_STOP(ch)    do { (void)ch; extern bool hw_afsk_dac_isr; PORTB &= ~BV(3); hw_afsk_dac_isr = false; } while (0)
+
+#endif /* HW_AFSK_H */